激光冲击微造型铝硅合金表面摩擦学性能研究

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1、万方数据激光冲击微造型铝硅合金表面摩擦学性能研究II万方数据江苏大学硕士学位论文ABSTRACTLaserPeeningTexturing(LPT)isthetechnologywhichpreparesthemicro-dimplearraysonthespecimensbylaserpeeningtosignificantlyimprovethetribologyperformanceofthematerial．LPThastheadvantagesbothofthestrengtheneffectoflaserpeenin

2、gandtheimprovementoftribologyperformancebymicro—texture．Thereby,itiswidelyconcemedinthefieldoffrictionandwear．Inthisstudy,ZL109aluminium·siliconalloywasmicro-texturedbylaserpeening．Themechanicalpropertiesofspecimensuntexturedandmicro—texturedweremeasured．Thedryfricti

3、onandmixedlubricationfrictiontestswerecarriedoutwiththemicro—texturedspecimenstoresearchtheinfluencelawofLPT．Themainworkisasfollows：1)Inthemechanicalproperties：Thestrengthenmechanismofresidualstress，micro-structureandmechanicalpropertiesWasdiscussedbasedonthetheoryof

4、LPT．Thespecimensweremicro-texturedwithdifferentareadensitiyanddepthtodiameterratiobydifferentprocessingparametersofLPT．Therelationbetweenlaserprocessingparametersandmicro．texturecharacteristics(residualstress，nano-hardness，elasticitymodulus)wasestablishedthroughmeasu

5、ringthemicro-dimplemorphologytoprovidethebasisfortheselectionoffollowingfrictiontestparameters．2)Indryfrictionperformance：Thedryfrictiontestswereaccomplishedtoanalyzethetribologyproperties(averagefrictioncoefficient，instantaneousfrictioncoefficient，weartrackdepth，wea

6、rvolume)ofspecimensmicro-texturedbydifferentlaserpeeningprocessingparameters．Accordingtothedryfriction—weartheoryandtheobservationofwearsurfacemorphology，the(hyfriction-wearmechanismofdifferentspecimensuntexturedandmicro．texturedWasstudied．Theresultshowsthatthespecim

7、ensmicro．texturedwith30％areadensityand0．092depthtodiameterratiohavethebestdryfrictionperformance31Inmixedlubricationfrictionperformance：Themixedlubficmiontestswereaccomplishedtostudymerelmionbetweenmicro．textm'echaracteristicsand1ubricationstate(instantaneousfriction

8、coefficient)．Basedonthefriction—weartheoryofmixedlubrication．theinfluenceofmicro．texturecharacteristicsonmixedlubricationfrictionpe